Theirs were the faces that stood out in the chaotic helicopter evacuation off the Sinjar Mountains.

Tears streamed down the cheeks of 15-year-old Aziza Hamid and her 17-year-old sister, Dunya, who were among a lucky few to fight their way onto an Iraqi helicopter, a scene captured this week by a CNN crew on the flight taking food and water to thousands trapped by extremist fighters.

Two days later, CNN's Ivan Watson tracked the girls and some of their family members to the third floor of a derelict building in Zakho, Iraq, a makeshift shelter where roughly 1,000 Yazidis with nowhere to go have taken refuge.

Inside, the girls, their brothers and their 16-month-old cousin are confined with their meager belongings to a few feet of bare concrete.

"You no have food. You no have drink. You no have sleep. It is very, very poor," the girls' brother, Kareem, told Watson on Wednesday. "It's no good."

Aziza Hamid, 15, was rescued from Mount Sinjar and now lives in a derelict building that houses more than a thousand other refugees.

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A portrait of Aziza's family.

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Yazidis rescued from ISIS 9 photos

Yazidis rescued from ISIS9 photos

Yazidis rescued from ISIS – An Iraqi gunner opens fire at possible ISIS targets during a rescue operation by the Iraqi Air Force and Kurdish Peshmerga fighters on Monday, August 11. The dramatic operation at Iraq's Mount Sinjar involved taking supplies to desperate Yazidis and even bringing some aboard a helicopter to make it safely out of the area.

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Yazidis rescued from ISIS – A CNN crew was on the flight, which took diapers, milk, water and food to the site. Thousands of people have been fleeing from the militant group ISIS, which has taken over large swaths of northern and western Iraq as it seeks to create an Islamic caliphate that stretches from Syria into Iraq.

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Yazidis rescued from ISIS – A couple dozen civilians were rescued during the operation. CNN's Ivan Watson, who was on the chopper, described the mission as "heroic."

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Yazidis rescued from ISIS – An elderly woman is put on the helicopter.

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Yazidis rescued from ISIS – Yazidi people sit on the aircraft with members of the CNN crew.

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Yazidis rescued from ISIS – An elderly Yazidi man cries after he was rescued.

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Yazidis rescued from ISIS – A toddler named Helen sits in her mother's lap after being rescued.

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Yazidis rescued from ISIS – Rescued civilians sit on the helicopter.

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Yazidis rescued from ISIS – Yazidi people arrive safely to the Kurdish territory.

ISIS fighters have vowed to kill the Yazidis, calling them "devil worshipers."

Iraqi refugees fleeing ISIS 17 photos

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Iraqi refugees fleeing ISIS – A Yazidi family from Sinjar cleans a spot for themselves in a derelict building that houses more than a thousand other refugees on Thursday, August 14, in Zakho, Iraq.

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Iraqi refugees fleeing ISIS – A woman and child sit in the makeshift housing on Thursday.

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Iraqi refugees fleeing ISIS – A Yazidi woman holds her baby while crossing Peshkhabour bridge from Syria back into Kurdish-controlled Iraq on Tuesday, August 12.

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Iraqi refugees fleeing ISIS – Entire families carry nothing but the clothes on their back. Some are barefoot. And not everyone who set out on the arduous journey survived.

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Iraqi refugees fleeing ISIS – The militant group ISIS, which now calls itself the Islamic State, executes civilians who don't adhere to its version of Sunni Islam.

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Iraqi refugees fleeing ISIS – Yazidis fled into the barren and windswept Sinjar Mountains more than a week ago after ISIS captured their town.

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Iraqi refugees fleeing ISIS – Descendants of Kurds and followers of an ancient pre-Islamic religion, Yazidis are one of Iraq's smallest minorities, and have been persecuted for centuries, but they have a strong sense of community.

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Iraqi refugees fleeing ISIS – According to some accounts, Syrian Kurds also helped people use parts of northeastern Syria under their control to reach Kurdish areas of northern Iraq.

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Iraqi refugees fleeing ISIS – A young refugee carries a disabled man across the bridge.

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Iraqi refugees fleeing ISIS – Thousands trudge across a river to seek humanitarian aid in Syria.

Iraqi refugees fleeing ISIS – A senior Kurdish official estimated that as many as 70,000 people remain trapped on Mount Sinjar, and that at least 100 have died so far from dehydration and the heat. CNN could not independently confirm those estimates.

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Iraqi refugees fleeing ISIS – A man weeps after been reunited with his family.